634445420 has 48 divisors (see below), whose sum is σ = 1528547328. Its totient is φ = 216684480.

The previous prime is 634445407. The next prime is 634445429. The reversal of 634445420 is 24544436.

It is not an unprimeable number, because it can be changed into a prime (634445429) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 28205 + ... + 45435.

It is an arithmetic number, because the mean of its divisors is an integer number (31844736).

Almost surely, 2^634445420 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 634445420, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (764273664).

634445420 is an abundant number, since it is smaller than the sum of its proper divisors (894101908).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

634445420 is a wasteful number, since it uses less digits than its factorization.

634445420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17510 (or 17508 counting only the distinct ones).

The product of its (nonzero) digits is 46080, while the sum is 32.

The square root of 634445420 is about 25188.2000150864. The cubic root of 634445420 is about 859.2735076087.

Adding to 634445420 its reverse (24544436), we get a palindrome (658989856).

The spelling of 634445420 in words is "six hundred thirty-four million, four hundred forty-five thousand, four hundred twenty".